| 海底地形变化对地震波场以及偏移成像的影响 |
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| 引用本文： | 韩复兴,王坤,孙建国.海底地形变化对地震波场以及偏移成像的影响[J].海洋学报(英文版),2019,38(3):151-158. |
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| 作者姓名： | 韩复兴 王坤 孙建国 |
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| 作者单位： | 吉林大学地探学院, 波动理论与成像技术实验室, 长春, 130062,吉林交通职业技术学院, 长春, 130012,吉林大学地探学院, 波动理论与成像技术实验室, 长春, 130062 |
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| 基金项目： | The National Natural Science Foundation of China under contract Nos 41504084 and 41274120. |
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| 摘 要： | 本文针对海洋地球物理勘探数据处理当中偏移成像剖面中深层层位模糊，像场能量较弱的问题，从起伏海底在反射地震数据采集当中某个时刻发生变化着手，分析讨论了当海底发生微小变化以及海底发生稍大变化时模型差异对波场记录以及偏移成像剖面的影响，通过分析对比原始速度模型以及变化后速度模型同一点位上采集的波场记录以及波场记录在变化前后模型上的偏移成像剖面可以得出：不管数据采集是沿着测线方向进行还是逆着测线方向进行，对于起伏海底发生微小变化的速度模型，海底的微小变化对波场记录以及偏移剖面的影响很小；对于起伏海底发生较大变化的速度模型，海底的变化对波场记录以及偏移剖面的影响非常大。
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| 关 键 词： | 海底地形 地震波场 地震反射 偏移成像 |
| 收稿时间： | 2018/5/2 0:00:00 |
The influence of irregular seafloor topography on the seismic wave field and migration imaging |
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| HAN Fuxing,WANG Kun and SUN Jianguo.The influence of irregular seafloor topography on the seismic wave field and migration imaging[J].Acta Oceanologica Sinica,2019,38(3):151-158. |
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| Authors: | HAN Fuxing WANG Kun and SUN Jianguo |
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| Institution: | 1.College for Geoexploration Science Technology, Jilin University, Changchun 130026, China2.Jilin Communications Polytechnic, Changchun 130012, China |
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| Abstract: | One of the problems experienced in marine geophysical exploration is that the layered features in the migration imaging profile are blurred and the seismic energy reflected is weaker in the middle or lower parts. In this study we model the seismic wavefield records in the undulating seafloor when there is both a slight change and significant change in seafloor topography to analyze its influence on the seismic reflection data and migration imaging profiles. We compare and analyze the wave field records collected at the same point on the original and modified velocity models, and the cross-bonding resulting migration imaging profiles. The results show that whether the seismic reflection data collection is performed along the direction of the survey line or against the direction of the survey line, slight changes in the seafloor topography have little effect on the wave field records and the migration profile, while significant changes in the seafloor topography have great effect on both the wave field records and migration profile. |
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| Keywords: | seafloor topography seismic wave field seismic reflections migration imaging |
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